It may be worth applying for Joseph's birth certificate. There aren't too many candidates and you should specify at least father's name and possibly occupation as conditions for issue of certificate. This is often easier using the local registrar's office as they don't tend to charge unless a certificate is issued. It would settle whether the Hannah in Australia is the same Hannah that was mentioned in the children's baptisms. If so, you could perhaps discount the late marriage...   And I would pronounce Hollis like Holly with a soft 'ss' at the end.   Best wishes, Irene